\\[-1.8ex] Soil Heterogeneity & $-$1.187$^{***}$ & $-$0.652$^{***}$ & $-$0.520$^{***}$ & $-$0.570$^{***}$ & $-$0.396$^{***}$ & $-$0.392$^{***}$ \\ 
  & (0.263) & (0.192) & (0.189) & (0.195) & (0.132) & (0.130) \\ 
\\[-1.8ex] 
Oster $\delta$ for $\beta=0$ &  & 1.43 & 1.20 & 1.48 & 1.05 & 1.03 \\ 
Observations & 23,322 & 23,322 & 23,322 & 23,322 & 23,322 & 23,260 \\ 
R$^{2}$ & 0.017 & 0.292 & 0.323 & 0.332 & 0.350 & 0.352 \\ 
